On Aug 6, 2005, at 3:48 AM, David Mann wrote:
Flash!?! For a moment let's forget about all else associated with
flash,
wouldn't using it slow things down as the camera computes how much
flash is
needed, and goes through all the mechanical and electronic stuff
it has to
go through before firing?
Some flash systems do a pre-fire for metering purposes, but many
(most?) will meter during the exposure and will cut off the flash
when enough light has been received so there will be no slowdown.
It works basically the same way as the LX's OTF metering, only it
takes about 1/10,000th of a second.
Even the Pentax P-TTL system with a prefire operates so quickly that
many people don't realize the flash has gone off twice.
Godfrey
